Hi NguyenMinhCold, There is some exception in your code behind. And the information states that to be able to view these kind of errors on remote machines need some changes in the web.config file. You can do one of the two things - 1. Try to access / repeat the same page from where you are publishing it (web server machine) without changing the web.config. This will enable you to view what exactly the error is. 2. Add customErrors mode="Off" tag in your web.config and see the error from the client machine. After that you can correct the error and restore the web.config if you have changed it on the server machine. "A good programmer is someone who looks both ways before crossing a one-way street." -- Doug Linder coolestCoder